[rules-users] Possible bug with incremental compilation

[Federico Bertola]

Hi all,
executing the test  in 
"drools/drools-compiler/src/test/java/org/drools/compiler/integrationtests/" 
all goes well except if i write a kmodule xml inside the KieFileSystem. 
Is this supposed to happen? I cannot add or remove a KieBase during 
incremental compilation, or I'm doing something dumb?

I'm on Ubuntu 12.04 64bit  java 1.7.0_55

Heres  a simple test case:

#########################################

     @Test
     public void shouldRecompileWithNewBases() {
         String drl1 = "global java.util.List list\n" + "rule R1 when\n"
                 + " $s : String() " + "then\n" + " list.add( \"a\" + $s );"
                 + "end\n";

         String drl2 = "global java.util.List list\n" + "rule R2 when\n"
                 + " $s : String() " + "then\n" + " list.add( \"b\" + $s );"
                 + "end\n";

         ReleaseId releaseId1 = KieServices.Factory.get().newReleaseId(
                 "it.mine", "test", "1.1");
         ReleaseId releaseId2 = KieServices.Factory.get().newReleaseId(
                 "it.mine", "test", "1.2");

         KieServices ks = KieServices.Factory.get();

         KieModuleModel kproj = ks.newKieModuleModel();
         KieBaseModel kieBaseModel1 = kproj.newKieBaseModel("KBase1")
                 .addPackage("it.mine.test");
kieBaseModel1.newKieSessionModel("KSession1").setDefault(true);

         KieFileSystem kfs = ks.newKieFileSystem();

         KieBuilder kieBuilder = ks.newKieBuilder(kfs);

         kfs.generateAndWritePomXML(releaseId1);
         kfs.write("src/main/resources/it/mine/test/rule.drl", drl1);

         // FIXME: without this line all goes well.
         kfs.writeKModuleXML(kproj.toXML());

         kieBuilder.buildAll();
         assertEquals(0, kieBuilder.getResults().getMessages().size());
         KieModule kieModule = kieBuilder.getKieModule();
         assertEquals(releaseId1, kieModule.getReleaseId());

         KieContainer kc = ks.newKieContainer(releaseId1);

         KieSession ksession = kc.newKieSession();
         List<String> list = new ArrayList<String>();
         ksession.setGlobal("list", list);
         ksession.insert("Foo");
         ksession.fireAllRules();

         list.clear();

         kfs.generateAndWritePomXML(releaseId2);
         kfs.write("src/main/resources/it/mine/test2/rule.drl", drl2);

         IncrementalResults results = ((InternalKieBuilder) kieBuilder)
                 .incrementalBuild();
         assertEquals(0, results.getAddedMessages().size());

         kieModule = kieBuilder.getKieModule();
         assertEquals(releaseId2, kieModule.getReleaseId());


         Results updateResults = kc.updateToVersion(releaseId2);
         assertEquals(0, updateResults.getMessages().size());
     }

#########################################

Heres the stack trace:

#########################################

java.lang.NullPointerException
     at 
org.drools.compiler.kie.util.ChangeSetBuilder.build(ChangeSetBuilder.java:51)
     at 
org.drools.compiler.kie.builder.impl.KieContainerImpl.update(KieContainerImpl.java:126)
     at 
org.drools.compiler.kie.builder.impl.KieContainerImpl.updateToVersion(KieContainerImpl.java:105)
     at 
it.mine.IncrementalCompilationTest.shouldRecompileWithNewBases(IncrementalCompilationTest.java:165)

#########################################

Thanks for the help!

Cheers,
Federico.